I dont understand the layout mechanism :( (i came from WPF)
i have an custom widget, this contains a QLabel as headline , and the rest of the widget space shoud used by a QListWidget.
QVBoxLayout *root = new QVBoxLayout(this); root->setSizeConstraint(QLayout::SetMinimumSize); /* mybay be this */ setLayout(root); _headLine = new QLabel("HeadLine", this); _headLine->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum); /* or maybe that */ root->addWidget(_headLine, Qt::AlignTop); /* and align top? */ _alarmListView = new QListWidget(this); _alarmListView->setItemDelegate(new ItemDelegate(_alarmListView)); root->addWidget(_alarmListView);
but both elems in my layout takes the same space 50/50 ! But i want, that the head line (QLabel) only takes its neede height, an the rest for the QListWidget.
Do i need a another layout?
For example , in WPF i can take a Dockpanel, and dock the Label to the top, and the reset space is uses by the list control. But in QT it seem must more complicated... to layout :(
quick solution: just don't overdo it:
QVBoxLayout *root = new QVBoxLayout(this); _headLine = new QLabel("HeadLine", this); root->addWidget(_headLine); _alarmListView = new QListWidget(this); _alarmListView->setItemDelegate(new ItemDelegate(_alarmListView)); root->addWidget(_alarmListView);
QSizePolicy::Minimumdoes not do what you think it does:
The sizeHint() is minimal, and sufficient. The widget can be expanded, but there is no advantage to it being larger (e.g. the horizontal direction of a push button). It cannot be smaller than the size provided by sizeHint().
What you want is
QSizePolicy::Maximumbut, again, you don't need to do anything, the default already does what you want
Oh thank;) it works.. but when i add "Qt::AlignTop" , does a 50/50 allignment.. thats confusing :(